Swivel arrangement for electric terminal plugs.



M. HERSKOVIT Z. SWIVEL ARRANGEMENT FOR ELECTRIC TERMINAL PLUGS.

APPLICATION FILED JULY 12,1913.

' 1,121,625., Patented 1160.22, 1914.

8 "illl f 4 A v l 32 47 4 jects giieeve member PATENT ()FFICE.

MAX HERSKOVITZ, or cnxo'neo, ILLINOIS.

SWIVEL ARRANGEMENT FOR ELECTRIC TERMINAL PLUGS.

' Specification of Letters Patent;

Patented Dec. 22, 1914.

1 Application filed July 12, 1913. Serial No. 778,663.

To all whom-it may concern:

Be it known that I, Max HERSKOVITZ, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Swivel Arrangements for Electrical Terminal Plugs, of which the following is a specification.

My inventlon relates to electrical termi-. nal plugs and contemplates improved and simplified features of construction and arrangement which will decrease the manufacturing cost thereof and will at the same time increase the efliciency. v

My invention relates particularly to swivel plugs and among its important obare to provideconstruction involving a minimum number of simple parts; to, pro yide construction which will enable the to swivel readily; to provide improved contact mechanism which eliminate waste of electrical conductors and which will enable connections to be more readily made; to provide construction and arrangement which will hold the various parts together but which will at the same. time allow free swiveling; and in general to provide improved, simplified and more etlicient construction and arrangement in devices of the character referred to.

On the accompanying sheet of drawings, Figure 1 is a longitudinal diametrical sectional View of the plug, Fig. 2 is an end view thereof, Fig. 3 is a perspective view of the tip contact members, Fig. 4 is a perspective view of the plug parts separated, and Fig. 5 is a perspective view of the sleeve contact terminal.

The sleeve member S comprises a cup shaped head 10 of insulating material in whoseend is permanently secured the base of the sleeve 11, this sleeve abutting against the internal shoulder 12. The outer end of the sleeve is threaded in the visual manner for engaging the threads of terminal sockets.

' ceiving the terminal screw 19, a passageway 20 extending from the pocket 17 to the base 01E the core for accommodating the conductor 21 leadingto terminal screw 19. The tip member-has the central longitudinal bore for receiving the bolt 23 forming a conductor-to thetip contact or washer 2a which is cup shaped to fit into the pocket 25 provided therefor in the end of the tip member. The lateral flange 2 1' on the contact 24: engages against the outer end of the tip member and contacts with the tip terminal of sockets into which the plug is screwed. The bolt 23 extends through the base of the cup shaped contact 21 and its head 23 engages in the contact and against the base thereof. The base of the tip member has the peripheral flange 26 extending therefrom withinwhich flange is the tip of bolt 23, and carrying the terminal screw 29 for receiving the other conductor 30. Adjacent its base the tip member has the peripheral locking groove 31 for receiving the ends of spring tongues 32 formed in the sleeve 11 and formingintegral parts thereof.

The sleeve member head 10 has the inlet opening 33 for the conductors 21 and 30. When the plug is to be connected with the conductors, the sleeve and tip members are separated, and the conductor ends slipped through opening 33 of the head 10, the conductor 30 is clamped by the screw 29 against terminal plate 27 while the conductor 21 is extended through passageway 20 to pocket 17 where it is clamped by'screw 19 to the terminal lug 18. The tip member is now forced into the sleevemember until the looking groove 31 receives-the ends of the spring tongues 32 and the end of sleeve 11 abuts against the flange 16 of the contact ring 15v on the tip member. The plug can now be applied to a terminal socket and the sleeve member rotated into threaded engagement with the socket sleeve, the tip member being carried intothe socketwithout rotating and until its tip contact 21 securely abuts against the socket tip contact. During such rotation of the plug sleeve member the end o- 'sleeve11 works against flange 16 of the con.-.-

are

-held in firm electrical engagement.

The plug has thus cl'licient electrical contact with the socket and there can be no arcing. 7

It will be noted that the conductor screw 19 eliminates waste of conductors. In prior plugs one of the conductors extended entirely through the tip member to the tip contact and needed to be longer than the other conductor which extended only a short distance to the other terminal. It was there-.

fore necessary to cut-a piece olf of one of the ponductors when connectlon was' made with the plug, thus causing waste. In my plug shown and described as changes-may be pos sible which would still come within the scope of the invention.

I/claim as follows:

1. In an electrical terminal plug, the combination with a sleeve member comprising a head and athreaded sleeve extending therefrom, of a tip member comprising a core, a terminal bolt extending through the core and a terminal plate secured to the core base by said belt, a contact ring on said core having a terminal lug extending therefrom,

and a fl ange on said contact ring, said sleeve fittmg over said core and abutting against said flange when the core is inserted in the sleeve.

2. In a swivel terminal plug the combination with a threaded sleeve, of a core having tip and sleeve contacts thereon, and a band surrounding the outer end of said'core and connected with said sleeve contact and havinga flange forming an abutment for the sleeve when the plug is threaded into a socket.

3. In a swivel terminal the combination with a threaded sleeve, of a core having tip and sleeve terminals thereon and hav-ing an annular; peripheral groove, a colgact band held in said groove and 'connected t,o said sleeve contact, and a flange on said' band forming an abutment for the sleeve wlfin the plug is screwed into a socket.

4:, In a swivel plug, the combination with a threaded sleeve of a core having a contact tip and a contact band thereon, a terminal lug extending from said band toward the base of the core, a terminal plate on the base of the core, a bolt extending through the core and connecting said t1p contactand terminal plate, and a flange on said band, said sleeve engaging against said flange when the core is inserted in the sleeve. I

In testimony whereof I have signed 'my name to this specification in the presence of, 70

two subscribing witnesses this 5th day of July, A. D. 1913, at Chicago, Illinois.

MAX HERSKOVITZ.

Witnesses:

Enw. R. NEUMAN, E. BLUM. 

